I was wondering the same thing... and came to the same conclusion. There's not much yet, and it's a shame. Do you know of any classification of these types of charts ? It seems to me that with 6 or 7 chart types we can cover around 90% of those, it's pretty much always the same and shouldn't be that hard to wrap into a package.

Actually I've started to work on a package to do just that. I looked at ggproto but I don't understand it much so I took the easier route. It would be nice to be able to use ggplot aesthetics though... and then plug them into gganimate for more fun.